A switchable 16-bit board like the 32k16 is what I'm after.
I'm a total noob when it comes to this system, but adding that 16-bit RAM can only help, especially if newer software comes out that uses it. The amount of new development on the TI-99 is a pleasant surprise and has been on the increase as of late.
If I'm going to have to solder up a rats nest of jumper wires in there anyway, what's 3-5 more wires if it makes the system run faster?